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use normal polymorphism to create vtable

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master
Francisco Paisana 5 years ago committed by Francisco Paisana
parent e2b10307ea
commit b5abba41a3
2 changed files with 67 additions and 76 deletions
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134
lib/include/srslte/common/move_callback.h
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@ -35,83 +35,68 @@ class move_callback;
namespace task_details {
//! Class used to type-erase the functor/lambda capture move/call/dtor operators
template <typename R, typename... Args>
struct oper_table_t {
using call_oper_t = R (*)(void* src, Args&&... args);
using move_oper_t = void (*)(void* src, void* dest);
using dtor_oper_t = void (*)(void* src);
class oper_table_t
{
public:
constexpr oper_table_t(bool in_buffer_) : is_in_buffer(in_buffer_) {}
virtual R call(void* src, Args&&... args) const = 0;
virtual void move(void* src, void* dest) const = 0;
virtual void dtor(void* src) const = 0;
bool is_in_buffer;
};
//! Returns a operator table for when the move_function object is empty
const static oper_table_t* get_empty() noexcept
{
const static oper_table_t t{true,
[](void* src, Args&&... args) -> R { throw std::bad_function_call(); },
[](void*, void*) {},
[](void*) {}};
return &t;
}
template <typename R, typename... Args>
class empty_table_t : public oper_table_t<R, Args...>
{
public:
constexpr empty_table_t() : oper_table_t<R, Args...>(true) {}
R call(void* src, Args&&... args) const final { throw std::bad_function_call(); }
void move(void* src, void* dest) const final {}
void dtor(void* src) const final {}
};
//! Returns a operator table for when the move_function fits the small buffer
template <typename Func>
const static oper_table_t* get_small() noexcept
template <typename FunT, typename R, typename... Args>
class smallbuffer_table_t : public oper_table_t<R, Args...>
{
public:
constexpr smallbuffer_table_t() : oper_table_t<R, Args...>(true) {}
R call(void* src, Args&&... args) const final { return (*static_cast<FunT*>(src))(std::forward<Args>(args)...); }
void move(void* src, void* dest) const final
{
const static oper_table_t t{
true,
[](void* src, Args&&... args) -> R { return (*static_cast<Func*>(src))(std::forward<Args>(args)...); },
[](void* src, void* dest) -> void {
::new (dest) Func{std::move(*static_cast<Func*>(src))};
static_cast<Func*>(src)->~Func();
},
[](void* src) -> void { static_cast<Func*>(src)->~Func(); }};
return &t;
::new (dest) FunT{std::move(*static_cast<FunT*>(src))};
static_cast<FunT*>(src)->~FunT();
}
void dtor(void* src) const final { static_cast<FunT*>(src)->~FunT(); }
};
//! Returns a operator table for when the move_function fits the big buffer
template <typename Func>
const static oper_table_t* get_big() noexcept
template <typename FunT, typename R, typename... Args>
class heap_table_t : public oper_table_t<R, Args...>
{
public:
constexpr heap_table_t() : oper_table_t<R, Args...>(false) {}
R call(void* src, Args&&... args) const final { return (**static_cast<FunT**>(src))(std::forward<Args>(args)...); }
void move(void* src, void* dest) const final
{
const static oper_table_t t{
false,
[](void* src, Args&&... args) -> R { return (**static_cast<Func**>(src))(std::forward<Args>(args)...); },
[](void* src, void* dest) -> void {
*static_cast<Func**>(dest) = *static_cast<Func**>(src);
*static_cast<Func**>(src) = nullptr;
},
[](void* src) -> void { delete (*static_cast<Func**>(src)); }};
return &t;
*static_cast<FunT**>(dest) = *static_cast<FunT**>(src);
*static_cast<FunT**>(src) = nullptr;
}
oper_table_t(const oper_table_t&) = delete;
oper_table_t(oper_table_t&&) = delete;
oper_table_t& operator=(const oper_table_t&) = delete;
oper_table_t& operator=(oper_table_t&&) = delete;
~oper_table_t() = default;
const bool is_in_buffer;
const call_oper_t call;
const move_oper_t move;
const dtor_oper_t dtor;
private:
oper_table_t(bool is_in_buffer_, call_oper_t call_, move_oper_t move_, dtor_oper_t dtor_) :
is_in_buffer(is_in_buffer_),
call(call_),
move(move_),
dtor(dtor_)
{}
void dtor(void* src) const final { delete (*static_cast<FunT**>(src)); }
};
//! Metafunction to check if object is move_callback<> type
template <class>
struct is_inplace_task : std::false_type {};
struct is_move_callback : std::false_type {};
template <class Sig, size_t Capacity>
struct is_inplace_task<move_callback<Sig, Capacity> > : std::true_type {};
struct is_move_callback<move_callback<Sig, Capacity> > : std::true_type {};
//! metafunctions to enable/disable functions based on whether the callback fits small buffer or not
template <typename T, size_t Cap, typename FunT = typename std::decay<T>::type>
using enable_small_capture =
typename std::enable_if<sizeof(FunT) <= Cap and not is_inplace_task<FunT>::value, bool>::type;
using enable_if_small_capture =
typename std::enable_if<sizeof(FunT) <= Cap and not is_move_callback<T>::value, bool>::type;
template <typename T, size_t Cap, typename FunT = typename std::decay<T>::type>
using enable_big_capture = typename std::enable_if < Cap<sizeof(FunT) and not is_inplace_task<FunT>::value, bool>::type;
using enable_if_big_capture =
typename std::enable_if < Cap<sizeof(FunT) and not is_move_callback<T>::value, bool>::type;
} // namespace task_details
@ -121,30 +106,32 @@ class move_callback<R(Args...), Capacity>
static constexpr size_t capacity = Capacity >= sizeof(void*) ? Capacity : sizeof(void*);
using storage_t = typename std::aligned_storage<capacity, alignof(std::max_align_t)>::type;
using oper_table_t = task_details::oper_table_t<R, Args...>;
static constexpr task_details::empty_table_t<R, Args...> empty_table{};
public:
move_callback() noexcept { oper_ptr = oper_table_t::get_empty(); }
move_callback() noexcept : oper_ptr(&empty_table) {}
template <typename T, task_details::enable_small_capture<T, capacity> = true>
template <typename T, task_details::enable_if_small_capture<T, capacity> = true>
move_callback(T&& function) noexcept
{
using FunT = typename std::decay<T>::type;
oper_ptr = oper_table_t::template get_small<FunT>();
static const task_details::smallbuffer_table_t<FunT, R, Args...> small_oper_table{};
oper_ptr = &small_oper_table;
::new (&buffer) FunT{std::forward<T>(function)};
}
template <typename T, task_details::enable_big_capture<T, capacity> = true>
template <typename T, task_details::enable_if_big_capture<T, capacity> = true>
move_callback(T&& function)
{
using FunT = typename std::decay<T>::type;
oper_ptr = oper_table_t::template get_big<FunT>();
static const task_details::heap_table_t<FunT, R, Args...> heap_oper_table{};
oper_ptr = &heap_oper_table;
ptr = static_cast<void*>(new FunT{std::forward<T>(function)});
}
move_callback(move_callback&& other) noexcept
move_callback(move_callback&& other) noexcept : oper_ptr(other.oper_ptr)
{
oper_ptr = other.oper_ptr;
other.oper_ptr = oper_table_t::get_empty();
other.oper_ptr = &empty_table;
oper_ptr->move(&other.buffer, &buffer);
}
@ -154,14 +141,14 @@ public:
{
oper_ptr->dtor(&buffer);
oper_ptr = other.oper_ptr;
other.oper_ptr = oper_table_t::get_empty();
other.oper_ptr = &empty_table;
oper_ptr->move(&other.buffer, &buffer);
return *this;
}
R operator()(Args&&... args) const noexcept { return oper_ptr->call(&buffer, std::forward<Args>(args)...); }
bool is_empty() const { return oper_ptr == oper_table_t::get_empty(); }
bool is_empty() const { return oper_ptr == empty_table; }
bool is_in_small_buffer() const { return oper_ptr->is_in_buffer; }
void swap(move_callback& other) noexcept
@ -198,6 +185,9 @@ private:
const oper_table_t* oper_ptr;
};
template <typename R, typename... Args, size_t Capacity>
constexpr task_details::empty_table_t<R, Args...> move_callback<R(Args...), Capacity>::empty_table;
} // namespace srslte
#endif // SRSLTE_MOVE_CALLBACK_H

5
lib/test/common/queue_test.cc
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@ -339,8 +339,9 @@ int test_inplace_task()
srslte::move_callback<void()> t{l0};
srslte::move_callback<void()> t2{[v]() mutable { v = 2; }};
// sanity static checks
static_assert(task_details::is_inplace_task<std::decay<decltype(t)>::type>::value, "failed check\n");
static_assert(std::is_base_of<std::false_type, task_details::is_inplace_task<std::decay<decltype(l0)>::type> >::value,
static_assert(task_details::is_move_callback<std::decay<decltype(t)>::type>::value, "failed check\n");
static_assert(
std::is_base_of<std::false_type, task_details::is_move_callback<std::decay<decltype(l0)>::type> >::value,
"failed check\n");
t();

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